**Question:** Morphine is contraindicated in all except

A. Age below 2 years
B. Patients with severe respiratory depression
C. Patients with known hypersensitivity to opioids
D. Patients with severe liver disease

**Correct Answer:** .

**Core Concept:** Morphine is an opioid analgesic commonly used for pain relief in various medical conditions. However, its use has certain contraindications, which are conditions or factors that disqualify the patient from receiving morphine due to potential severe adverse effects.

**Why the Correct Answer is Right:** Morphine is contraindicated primarily due to its potential for causing severe adverse reactions. In case A, administering morphine to infants under two years old is contraindicated because their immature body systems, particularly the respiratory and cardiovascular systems, are not fully developed, making them more susceptible to the adverse effects of morphine.

**Why Each Wrong Option is Incorrect:**

A. Age below 2 years (Correct Answer): Morphine is contraindicated in infants under two years old due to their immature physiology.
B. Patients with severe respiratory depression (Correct Answer): Morphine can worsen respiratory depression in patients with pre-existing respiratory problems, posing a significant risk to their health.
C. Patients with known hypersensitivity to opioids: Morphine is an opioid, and patients with a history of hypersensitivity to opioids are not suitable candidates for morphine treatment.
D. Patients with severe liver disease: Morphine is primarily eliminated by the liver, and severe liver disease may lead to increased morphine levels and severe adverse reactions.

**Clinical Pearl:** When choosing analgesics, it is crucial to consider the patient's age, physiological condition, allergy history, and organ function status to ensure safe and effective treatment. Assessing these factors will help prevent severe adverse reactions and ensure optimal pain management.